1. Preheat oven to 350 degrees and line cookie sheets with parchment paper.

2. Sift cake mix into a large bowl to remove ay lumps.

3. Add eggs, oil and vanilla extract and stir until smooth. Dough will be thick.

4. Make dough balls (about the size of golf balls-or a little smaller) and place on cookie sheets 2 inches apart and gently press down on the dough balls to flatten them out a bit.

5. Bake for 6-8 minutes, depending on how fudgey or cakey you prefer them.

6. Let cool.

7. Brownie Batter Filling: Beat butter, brownie mix, cocoa powder, salt, vanilla extract and milk together until smooth. Slowly add in powdered sugar a little at a time until you reach your desired consistency. Taste. If it's not sweet enough for your liking, add more powdered sugar (and milk if it gets too stiff).

8. Frost the bottoms of half the cookies and then sandwich the unfrosted cookies on top of the frosted ones to make your Oreos! Place in a tupperware and let set in the fridge for at least 30 minutes until eating. I will usually just let them sit overnight! (You don't have to let them chill but I think they're SO much better cold :) )